Shaft attachment apparatus



March 9, 1965 J. GLASER SHAFT ATTACHMENT APPARATUS Filed April 30, 1962 INVENTORI JERRY GLASER, L/ flab-5%;

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United States Patent ()ffice iffffi it is seen that the tapered portion on shaft bushing mem- 3,172,639 her engages tapered portion 14 on shaft member 4. SHAFT ATTACHMENT APPARATUS FIG. 2 is representative of the tapered shaft and bushing Jerry Glaser, Los Angeles, Calif., assignor to The Garrett Corporation Los Angeles Calif a corporatio of Structure existing on both extremities of shaft member 4.

California 5 As rotor 1 and shaft 4 expand axially with increased Filed Apr. 30, 1962, set. 191,155 heat, spr1ng 7 exerts a force in an outward direction on 5 Clalms (CL 2 7-53 bushing members 5 and 6 so as to maintain these members in proper alignment in relation to rotor 1. Spring 7 may This invention relates to shaft attachment apparatus f0! be constructed from the same material as used in both high teiiipeiaiiife rotating machinery end in Particular o rotor 1 and shaft 4. Alternatively, spring 7 may abut iaies i0 shaft bushing structure Capable of Compensating upon collar members 15, which may act as extensions of for differences in the rates of expansion for shaft bushing spring 7, If ll members are utilized they will be structure and rotor structure so as to obviate effects such d f th Same t ial as ed in member 1 and 4. as loss of concentricity between these two structures. Thus, the rate of expansion of spring 7 Will be the same In high temperature rotating machinery, in an elee- 15 as that of members 1 and 4, or alternatively, if collar trie motor for example, Shaft bushing structure must be members 15 are utilized they will have the same rate of capable of high temperature epemtion- The g p expansion as that of members 1 and 4. In the latter event aillfe Operation y be in the vicinity 0i 1000 in spring 7 may be made from a material having any desired this type of high temperature rotating machinery it may fli i t of i n, be desired to use y journal bearings A diiieienee iii As shown in FIG. 1 by reference character 16 a close the rates of expansion for the shaft bushing structure and fi i i t i d between pring 7 d to 1 or between the rotor structure can produce a loss of concentricity bell 15 d rotor 1 Th close fit shown t 16 revent tween these structures. Such a loss of concentricity can spring 7 f om canting or shifting its position on shaft 4.

cause high unbalance loads and other undesirable effects. Addi i ll it i t b t d th t th f e e ted by Accordingly, it is an Object of this inveiiiieii to Provide spring 7 on members 5 and 6 prevents members 5 and 6 shaft aiiaehmelit apparatus capable of eempensaiing for from canting or shifting their position in relation to rodifferences in the rates of expansion for shaft bushing ion 1 structure and other structure within high temperature ro- A members 1 4 d 7 expand di ll ith increased tailing meleiiiilei'yheat, line contact between surfaces 9 and 11 and between Another Object of this invention is to Provide apparatus surfaces 10 and 12 is maintained so as to continuously which will obviate effects such as loss of concentricity bei i rotor 1 i Proper alignrnont i h other units tween Shaft bushing structure and rotor structure ithin the temperature rotating machlnery Line could result in high unbalanced loads and other undesir- Contact is a term used to indicate the manner in which able effectsa point on tapered surfaces 9 and 10 tangentially engages A further Object of this invention is to Provide shaft a corresponding point on surfaces 11 and 12 respectively. attachment apparatus capable of maintaining close Surfaces 11 and 12 are rounded so that line contact may Fact With rotor structure and other rotating Paris Within be maintained between surfaces 9 and 11 and also between high temperature Operating machiiiery so as to Pieyeiit surfaces 10 and 12. The line contact established between shaft bushing structure from Gaming of shifting its posi" surface 9 and 11 and surface 10 and 12 facilitates the tion in relation to rotor sifiiciuremaintenance of rotor 1 in a proper position of alignment That these and other Objects and advantages of the for the efficient operation of the high temperature rotating vention are obtained will be readily apparent from a conmachinery sideration of the following description when taken in con- It i l b apparent to those kill d i thi t th t h junction With the drawings, in which! novel principles of the invention disclosed herein will FIGURE 1 is a sectional View taken through the center suggest various other modifications and applications of the 0f the rotor, shaft bushing structure and ceiiiiei shaft same. It is accordingly desired that the present invention Within g temperature rotating machinery; shall not be limited to the specific embodiment thereof FIGURE 2 is a detailed sectional view on an enlarged described herein. scale of the left hand end of the central shaft and shaft Having thus described my invention, 1 i bushing sil'lieiure- 1. Shaft attachment apparatus for supporting rotor Referring to FIG. 1 of the drawings there is illustrated Structure Within i temperature rotating hi a rotor element 1 for a high temperature rotating machine. Said apparatus comprising; A Plate member 2, made from the same material as rotor means concentric with said shaft for providing shaft is aiiaehed i0 rotor 1 y means of a P y of bolts bushing structure, said concentric means being made A shaft member 4 extends through rotor 1 along the rotor f material having a -fi l of expansion difcenter line' Shaft bushing members 5 and 6 are P ferent from that of material used in said shaft for tioned concentrically upon and at opposite ends of mem- Said rotating machinery; 4 Bushing members 5 and 6 are made 0111 material means for establishing line contact between said bushhaving a coefficient of expansion which differs from the lng Structure means d said rotor Structure; and coefficient of expansion of material used in rotor member means f Continuously positioning i bushing Stine. 1 and plate member Thfi material USCd fOl' shaft t n-e means on aid haft so as to maintain proper member 4 y be tungsten Carbide the likerotor alignment under varying heat conditions with In FIG. 1 a spring 7 is shown as being positioned interi id t ti hi mediate shaft bushing members 5 and 6. Spring force 2, Shaft attachment apparatus for supporting rotor from spring member 7 is exerted against members 5 and 6 structure within high temperature rotating machinery, said in an outwardly direction toward the extremities of shaft apparatus comprising: 4. Shaft bushing members 5 and 6, and spring 7 are means concentric with said shaft for providing shaft secured to shaft 4 by means of a nut 8. Shaft bushing bushing structure; 7 members 5 and 6 have tapered portions, designated 9 and means for establishing contact points between said 10 in FIG. 1, which engage rounded portions 11 and 12 bushing means and said rotor structure;

on plate member 2 and spring 7 respectively. In FIG. 2 said bushing means being made from material having a coefiicient of expansion different from that of materials utilized in said shaft for said rotating machinery;

and resilient means for continuously positioning said 4i members so as to continuously maintain proper rotor alignment under varying heat conditions within said rotating machinery. 5. Shaft attachment apparatus for supporting rotor bushing means on said shaft so as to maintain proper 5 structure within high temperature rotating machinery,

rotor alignment under varying heat conditions within said rotating machinery;

said positioning means being made from the same material as utilized in said rotor and shaft structure.

3. Shaft attachment apparatus for supporting rotor structure within high temperature rotating machinery, said apparatus comprising:

first and second shaft bushing members located at opposite ends of said shaft, said bushing members being made from material having a coeflicient of expansion different from that of material used in said shaft for said rotating machinery;

tapered portions on said bushing members for contacting said rotor structure;

and resilient means intermediate said bushing members for exerting a force on said bushing members so as to continuously maintain proper rotor alignment under varying heat conditions within said rotating machinery.

4. Shaft attachment apparatus for supporting rotor structure Within high temperature rotating machinery, said apparatus comprising:

first and second shaft bushing members located at opposite ends of said shaft;

tapered portions on said bushing members for contacting said rotor structure;

resilient means intermediate said bushing members;

tapered portions on said bushing members for contacting said resilient means;

rounded portions on said resilient means for contacting said bushing members;

said resilient means exerting a force on said bushing said apparatus comprising:

first and second shaft bushing members located at opposite ends of said shaft;

tapered portions on said bushing members for contacting said rotor structure;

resilient means intermediate said bushing members;

tapered portions on said bushing members for contacting said resilient means;

rounded portions on said resilient means for contacting said bushing members;

said resilient means exerting a force on said bushing members so as to continuously maintain proper rotor alignment under varying heat conditionswithin said rotating machinery;

means on opposite ends of said shaft for securing said bushing members to said shaft;

said bushing members having tapered portions for contacting said securing means;

said securing means having tapered portions for con tacting said bushing members; and

one of said securing means being adjustable so as to vary the position of said bushing members on said shaft.

References Cited in the file of this patent UNITED STATES PATENTS 2,213,432 McCartney Sept. 3, 1940 2,270,392 Talmage et al. Jan. 20, 1942 2,443,688 McFarland June 22, 1948 FOREIGN PATENTS 483,178 Germany Sept. 30, 1929 

1. SHAFT ATTACHMENT APPARATUS FOR SUPPORTING ROTOR STRUCTURE WITHIN HIGH TEMPERATURE ROTATING MACHINERY, SAID APPARATUS COMPRISING: MEANS CONCENTRIC WITH SAID SHAFT FOR PROVIDING SHAFT BUSHING STRUCTURE, SAID CONCENTRIC MEANS BEING MADE FROM MATERIAL HAVING A COEFFICIENT OF EXPANSION DIFFERENT FROM THAT OF MATERIAL USED IN SAID SHAFT FOR SAID ROTARY MACHINERY; MEANS FOR ESTABLISHING LINE CONTACT BETWEEN SAID BUSHING STRUCTURE MEANS AND SAID ROTOR STRUCTURE; AND MEANS FOR CONTINOUSLY POSITIONING SAID BUSHING STRUCTURE MEANS ON SAID SHAFT SO AS TO MAINTAIN PROPER ROTOR ALIGNMENT UNDER VARYING HEAT CONDITIONS WITHIN SAID ROTATING MACHINERY. 